Dry shampoo absorbs excess oils from your scalp on days when you have greasy hair but don't have time to wash it. It usually lasts me 4-5 hours if I use it on my fringe, but it would last longer if you avoid touching your hair.
The biggest brands for dry shampoo are Batiste and Girlz Only. They shouldn't cost more than £3, and I think that Girlz Only is cheaper (this is the one that I have). Some can be scented and others have no scent. I have a Girlz Only one and it has a fresh / soap-like smell, so I'd recommend one of these instead of a non scented one. These are both in spray form, but you can also get dry shampoo in powder form.
You should have at least one bottle of dry shampoo around for emergencies because it really is a lifesaver. Otherwise, any other kind of powder (body/baby powder etc) will work in exactly the same way. Simply pour a small amount into your hands, rub it in slightly, then tip your head over and rub the powder into your scalp. It absorbs excess oils and you'll immediately notice that your hair no longer looks greasy. Try to use one that isn't perfumed, like Simple or Johnson's baby powder, to prevent product build up / odour.

(Original post by Petulia)
Dry shampoo absorbs excess oils from your scalp on days when you have greasy hair but don't have time to wash it. It usually lasts me 4-5 hours if I use it on my fringe, but it would last longer if you avoid touching your hair.
The biggest brands for dry shampoo are Batiste and Girlz Only. They shouldn't cost more than £3, and I think that Girlz Only is cheaper (this is the one that I have). Some can be scented and others have no scent. I have a Girlz Only one and it has a fresh / soap-like smell, so I'd recommend one of these instead of a non scented one. These are both in spray form, but you can also get dry shampoo in powder form.
You should have at least one bottle of dry shampoo around for emergencies because it really is a lifesaver. Otherwise, any other kind of powder (body/baby powder etc) will work in exactly the same way. Simply pour a small amount into your hands, rub it in slightly, then tip your head over and rub the powder into your scalp. It absorbs excess oils and you'll immediately notice that your hair no longer looks greasy. Try to use one that isn't perfumed, like Simple or Johnson's baby powder, to prevent product build up / odour.